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DB\ ER to relational model

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PERSON(NID , NAME) ATTRIBUTES OF PERSON ENTITY

QUALIFICATION(NID , EXAMID , QUALIFICATION) SINCE RELATION CONTAINS KEY ATTRIBUTES OF BOTH ENTITIES ALONG WITH ITS ATTRIBUTE

EXAM(EXAMIID , EXAMNAME) ATTRIBUTES OF EXAM ENTITY

SINCE EXAM IS NOT WEAK ENTITY

EXAM(EXAMIID ,NID, EXAMNAME) COULD NOT BE HOLD
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